1.4+3x=2
3x=2-1.4
3x=0.6
x=0.6÷3
x=0.2
4x+0.12×3=2
4x+0.36=2.84
4x=2.84-0.36
4x=2.48
x=2.48÷4
x=0.62
4.5x+2.7x=15.12
(4.5+2.7)x=15.12
7.2x=15.12
x=2.1